CN105865147B - The system and method for high purity carbon monoxide and hydrogen rich gas coproduction liquid methane - Google Patents

The system and method for high purity carbon monoxide and hydrogen rich gas coproduction liquid methane Download PDF

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Publication number
CN105865147B
CN105865147B CN201610359591.0A CN201610359591A CN105865147B CN 105865147 B CN105865147 B CN 105865147B CN 201610359591 A CN201610359591 A CN 201610359591A CN 105865147 B CN105865147 B CN 105865147B
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pipeline
heat exchanger
main heat
tower
methane
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CN201610359591.0A
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CN105865147A (en
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韦向攀
卓跃光
王庆波
魏明明
苏建龙
郑树亮
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开封空分集团有限公司
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0204Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the feed stream
    • F25J3/0223H2/CO mixtures, i.e. synthesis gas; Water gas or shifted synthesis gas
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0233Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 1 carbon atom or more
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0252Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of hydrogen
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0257Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of nitrogen
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0261Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of carbon monoxide
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00Processes or apparatus using separation by rectification
    • F25J2200/70Refluxing the column with a condensed part of the feed stream, i.e. fractionator top is stripped or self-rectified
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00Processes or apparatus using separation by rectification
    • F25J2200/72Refluxing the column with at least a part of the totally condensed overhead gas
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2215/00Processes characterised by the type or other details of the product stream
    • F25J2215/04Recovery of liquid products
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00Refrigeration techniques used
    • F25J2270/02Internal refrigeration with liquid vaporising loop
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00Refrigeration techniques used
    • F25J2270/12External refrigeration with liquid vaporising loop
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00Refrigeration techniques used
    • F25J2270/24Quasi-closed internal or closed external carbon monoxide refrigeration cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00Refrigeration techniques used
    • F25J2270/66Closed external refrigeration cycle with multi component refrigerant [MCR], e.g. mixture of hydrocarbons
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2290/00Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/34Details about subcooling of liquids

Abstract

The present invention relates to gas low temperature separation field, the system and method for more particularly to a kind of high purity carbon monoxide and hydrogen rich gas coproduction liquid methane, the system mainly include raw material gas purifying unit, low-temperature liquefaction separative element, CO products compressor and azeotrope compressor;The low-temperature liquefaction separative element includes main heat exchanger, washes methane tower, dehydrogenation tower, domethanizing column and denitrification column, the dehydrogenation tower bottom of towe is equipped with the first evaporator, the domethanizing column bottom of towe is equipped with the second evaporator, tower top is equipped with the first condenser, the denitrification column bottom of towe is equipped with the 3rd evaporator, tower top is equipped with the second condenser, and the present invention obtains the rich H of high-purity by the four-column process flow2While with CO products, it can obtain high-purity liquid methane, device is to the adaptable of unstripped gas, reduce requirement of the device to unstripped gas impurity, according to the pressure of CO product gas, extract low-temperature receiver and heat source of a part of CO circulations as rectifying column out from the final stage or intergrade of CO compressors, eliminate nitrogen compressor and expanding machine, equipment is less, and investment is small.

Description

The system and method for high purity carbon monoxide and hydrogen rich gas coproduction liquid methane

Technical field

The present invention relates to gas low temperature separation field, more particularly to a kind of high purity carbon monoxide and hydrogen rich gas coproduction liquid The system and method for state methane.

Background technology

CO and H2It is the important synthesis material of chemical process, is widely used in a series of Organic chemical products and intermediate Synthesis, and CO and H2Produce generally with coal, natural gas or oil for raw material, convert to obtain by certain method, producing Except generation active principle CO and H in journey2Outside, a certain amount of CH is also produced4, N2、CO2Exist as a mixture Deng impurity, Chemical industry synthesis process usually requires the CO of high-purity, this just needs suitable method to be mixed thing separating-purifying.

CO and H2Separation method mainly have pressure swing adsorption method, membrane separation process and cryogenic rectification partition method.Membrane separating method Since the price of efficient selective film is high, application is less.Pressure swing adsorption method is commonly used in midget plant, operates flexibility and reliability, but Be with chemical field maximize development, pressure-variable adsorption when handling extensive gas load, equipment is more, take up a large area and Operating cost is high.Low temperature processing is using the difference of physical property between component, and separating-purifying is carried out by the method for cryogenic rectification, It is usually used in the CO and H in large-size chemical field2Mixed gas separating-purifying.

Liquid methane is a kind of cleaning, the efficient energy, and calorific value height is readily transported, CO and H disclosed in China2It is low In warm process for separation and purification, CO and H is simply considered2Carry out separating-purifying, in the case where nitrogen, methane content are higher, methane Discharged with other impurity as fuel, the value of methane is not utilized rationally, and Application No. 201510014562.6th, a kind of China of the method and apparatus of entitled synthesis gas separation hydrogen making and high-purity CO is special Profit is separated in the case where impurity content is more complicated using multitower, but needs to increase nitrogen circulation compression and expanding machine, flow Complexity, machine is more, high energy consumption, and without the reasonable utilization proposed to methane.The market of LNG is preferable in recent years, in CO and H2Higher liquid methane can be worth while separation with production economy, increases value-added content of product, so as to improve the whole of device Body economic benefit.

The content of the invention

It is an object of the invention to overcome above-mentioned deficiency of the prior art, when impurity nitrogen, the methane in unstripped gas contain When amount is higher, there is provided a kind of system and method for energy-efficient high purity carbon monoxide and hydrogen rich gas coproduction liquid methane, The present invention can obtain the high liquid methane of economic value while high-purity CO and hydrogen rich gas is produced.

The technical proposal of the invention is realized in this way:A kind of high purity carbon monoxide and hydrogen rich gas coproduction liquid methane System, which mainly includes raw material gas purifying unit, low-temperature liquefaction separative element, CO products compressor and azeotrope pressure Contracting machine;The low-temperature liquefaction separative element includes main heat exchanger, washes methane tower, dehydrogenation tower, domethanizing column and denitrification column, described Dehydrogenation tower bottom of towe be equipped with the first evaporator, the bottom of towe of the domethanizing column is equipped with the second evaporator, tower top is equipped with the first condensation Device, the denitrification column bottom of towe is equipped with the 3rd evaporator, tower top is equipped with the second condenser;The entrance connection of the clean unit is sent First pipeline of gas, the clean unit outlet are connected by second pipe with main heat exchanger;The lower part for washing methane tower Entrance is connected by the 3rd pipeline with the main heat exchanger, it is described wash methane tower top gas phase outlet by the 4th pipeline with Main heat exchanger is connected, and the 5th pipeline of hydrogen rich gas, the bottom liquid for washing methane tower are sent out in the primary heat exchanger warm end connection Mutually outlet connects first throttle valve by the 6th pipeline;The first throttle valve connects main heat exchanger by the 7th pipeline, described Main heat exchanger is connected by the 8th pipeline with the centre entrance of the dehydrogenation tower, the first throttle valve by the 9th pipeline with The upper entrance of the dehydrogenation tower is connected;The dehydrogenation top of tower gaseous phase outlet is connected by the tenth pipeline and the main heat exchanger Logical, the 11st pipeline of flash steam is sent out in the primary heat exchanger warm end connection;The bottom liquid phases outlet of the dehydrogenation tower passes through the 12 pipelines are connected with second throttle, and the second throttle is connected by the 13rd pipeline with the main heat exchanger, The main heat exchanger is connected by the 14th pipeline with the domethanizing column lower entrances, and the second throttle passes through the tenth Five pipelines are connected with the main heat exchanger, and the main heat exchanger passes through the 16th pipeline and the domethanizing column centre entrance phase Connection;The demethanizer bottom liquid-phase outlet is connected by the 17th pipeline with the main heat exchanger, the main heat exchanger The 18th pipeline of liquid methane is sent out in hot junction connection;The top gas phase outlet of the domethanizing column passes through the 19th pipeline and the 26 pipelines are connected, and the upper gaseous phase outlet of the domethanizing column is connected by the 20th pipeline with denitrification column centre entrance Logical, the first condensator outlet of top of the domethanizing column passes through the 3rd throttle valve and the denitrification column by the 21st pipeline The entrance of the second condenser of top is connected;The 22nd pipeline of bottom liquid phases outlet of the denitrification column, the 22nd 4th throttle valve is set on pipeline, and the 4th throttle valve is condensed by the 23rd pipeline and the top second of the denitrification column Device entrance connects, and the upper gaseous phase outlet of the denitrification column is connected by the 24th pipeline with the main heat exchanger, the master The 25th pipeline of exhaust gas is sent out in the connection of heat exchanger hot junction;The top gas phase outlet of the denitrification column passes through the 26th pipeline Connected with the main heat exchanger, the main heat exchanger produces mouth suction port of compressor with the CO by the 27th pipeline and is connected It is logical.

The CO products compressor is connected by the 28th pipeline with the main heat exchanger, and the main heat exchanger passes through 29th pipeline is connected with the first evaporator inlet of the dehydrogenation tower bottom of towe, the 29th pipeline and the 30th pipeline phase It is logical, entrance the 30th pipeline of connection of second evaporator of domethanizing column bottom of towe, the 31st pipeline of outlet, the 30th One pipeline is connected with the 32nd pipeline, and first evaporator outlet passes through the 32nd pipeline and the main heat exchanger phase Connection, the main heat exchanger are connected by the 33rd pipeline with the methane tower upper entrance of washing;First condenser Entrance connects the 34th pipeline, and the 34th pipeline is respectively communicated with the 33rd pipeline and the 35th pipeline, and the 35th Pipeline is connected with the main heat exchanger, and the main heat exchanger passes through the 36th pipeline and the CO products compressor centre entrance It is connected, the CO products compressor centre exit is connected by the 37th pipeline with the main heat exchanger, and the master changes Hot device is connected by the 38th pipeline with the 3rd evaporator inlet of denitrogenation tower bottom, and the 3rd evaporator outlet leads to Cross the 39th pipeline with the 5th throttle valve to be connected, the 5th throttle valve is connected with the 23rd pipeline, the CO productions Product compressor outlet connects the 45th pipeline.

The gaseous phase outlet of the azeotrope compressor is connected by the 40th pipeline with the main heat exchanger, described Main heat exchanger is connected by the 41st pipeline through the 6th throttle valve with the main heat exchanger, and the main heat exchanger passes through the 4th 12 pipelines are connected with azeotrope suction port of compressor;The azeotrope compressor liquid-phase outlet passes through the 43rd pipeline It is connected with the main heat exchanger, the main heat exchanger is by the 44th pipeline through the 7th throttle valve and the main heat exchanger phase Connection.

It is the main heat exchanger, first evaporator, second evaporator, the 3rd evaporator, described first cold Condenser and second condenser be for vacuum brazing plate-fin heat exchanger, it is described wash methane tower, dehydrogenation tower, domethanizing column, Denitrification column is regular packed tower or filler and float valve combined type rectifying column.

The CO products compressor delivery pressure is:0.5 MPa ~3.5MPa;The CO products compressor is used for circulation portions Point extraction pressure be:0.5MPa~3.5MPa.

The clean unit inlet pressure is:3.0MPa ~ 6.0MPa, methane content volume fraction are 0.5% ~ 10%, nitrogen Content volume fraction is 4% ~ 8%;The dehydrogenation pressure tower is 0.9MPa ~ 2.5MPa;The domethanizing column and denitrification column pressure Power is 0.2MPa ~ 0.6MPa.

Azeotrope is mixed according to a certain percentage using nitrogen, methane, ethene, propane and isopentane.

A kind of method of high purity carbon monoxide and hydrogen rich gas coproduction liquid methane, it is characterised in that:This method is as follows:

High nitrogen, the raw material of methane content enter clean unit by the first pipeline, pass through the adsorbent in clean unit By the trace amounts of CO in unstripped gas after absorption2Removed with water, the unstripped gas after imurity-removal enters main heat exchanger by second pipe Certain temperature is cooled to, is come out the methane wash in raw material into the methane tower of washing by the 3rd pipeline after cooling, To wash methane top of tower gaseous phase outlet and obtain hydrogen rich gas, hydrogen rich gas enters main heat exchanger by the 4th pipeline and recycles cold and re-heat, Sent out after hydrogen rich gas re-heat by the 5th pipeline, raw material after washing methane tower bottom liquid-phase outlet and obtaining methane concentration passes through the Six pipelines throttle through first throttle valve, and two parts are divided into after throttling, and a part enters main heat exchanger re-heat by the 7th pipeline, multiple Enter after heat through the 8th pipeline in the middle part of dehydrogenation tower, another part is directly accessed dehydrogenation tower upper entrance by the 9th pipeline, de- Rectifying separation is carried out in hydrogen tower, obtains flash steam in dehydrogenation top of tower gaseous phase outlet, flashed vapour is changed by the tenth pipeline into master Hot device recycling cold and re-heat, are sent out after flashed vapour re-heat by the 11st pipeline, dehydrogenation tower bottom liquid-phase outlet obtain into Raw material after the concentration of one step is throttled by the 12nd pipeline through second throttle, is divided into two parts after throttling, and a part passes through the 13 pipelines enter main heat exchanger re-heat, enter domethanizing column lower entrances through the 14th pipeline after re-heat, and another part passes through 15th pipeline is cooled to certain temperature into main heat exchanger, enters in the middle part of domethanizing column by the 16th pipeline after cooling Mouthful, high-purity liquid methane is obtained in demethanizer bottom liquid-phase outlet, liquid methane enters main heat exchange by the 17th pipeline Device is subcooled, and is sent out after supercooling by the 18th pipeline, exports to obtain certain density CO by the in domethanizing column upper gaseous phase 20 pipelines enter denitrification column centre entrance, and the further imurity-removal in denitrification column, exports to obtain in denitrification column bottom liquid phases High-purity CO is throttled by the 22nd pipeline through the 4th throttle valve, is entered after throttling by the 23rd pipeline at the top of denitrification column Second condenser inlet exports to obtain rich nitrogen exhaust gas, exhaust gas passes through the 24th pipe as low-temperature receiver in denitrification column upper gaseous phase Road enters main heat exchanger re-heat and recycles cold, after re-heat, is sent out by the 25th pipeline.

The cold of device is provided mainly by CO circulations throttling and refrigerant circulation throttling refrigeration, is gone out from CO product compressors A part of CO of mouth is cooled to certain temperature by the 28th pipeline into main heat exchanger, passes through the 29th after cooling respectively Pipeline and the 30th pipeline enter the first evaporator of dehydrogenation tower bottom, the second evaporator of domethanizing column bottom of towe, make in evaporator It is cooled for heat source, is mixed after cooling and continue to cool down into main heat exchanger by the 32nd pipeline, three parts are divided into after cooling, A part is entered by the 33rd pipeline washes methane tower, comes out the methane wash in raw material as cleaning solution, another part Low-temperature receiver is used as by re-heat partial gasification into the first condenser of demethanizer overhead by the 34th pipeline, in the first condenser Top obtains gas phase CO and is mixed by the 19th pipeline with the 26th pipeline gas phase, and liquid phase CO is obtained in the first condenser lower curtate Low-temperature receiver is used as into the second condenser of denitrification column after the throttling of the 3rd throttle valve by the 21st pipeline, last part passes through 35th pipeline returns to main heat exchanger re-heat recycling cold, is compressed after recycling cold by the 36th pipeline into CO products Machine centre entrance, an extraction part in CO products compressor middle part is cooled down by the 37th pipeline into main heat exchanger, after cooling It is used as heat source into the 3rd evaporator of denitrification column by the 38th pipeline to be cooled, by the 39th pipeline through after cooling Five throttle valves are mixed with the 23rd pipeline material, and the second condenser of denitrification column is entered after mixing, is made in the second condenser Gasify to obtain CO products by re-heat for low-temperature receiver, CO products enter main heat exchanger re-heat by the 26th pipeline and recycle cold, return It is compressed after receipts cold into CO products suction port of compressor to certain pressure and product submitting is used as by the 45th pipeline;Come Cooled down from the gas phase cryogen of azeotrope compressor by the 40th pipeline into main heat exchanger, be cooled to certain temperature Backflowed afterwards by the 41st pipeline through the 6th throttle valve throttling refrigeration into main heat exchanger, from azeotrope compressor Liquid phase cryogen is cooled to certain temperature into main heat exchanger by the 43rd pipeline and extracts out, by the 44th pipeline through the 7th Throttle valve throttling refrigeration, backflows into main heat exchanger after throttling refrigeration, sends out main heat exchanger with another burst of cryogen mixing re-heat, leads to Cross the 42nd pipeline and enter azeotrope compressor, complete kind of refrigeration cycle.

The good effect that technical scheme produces is as follows:For height containing nitrogen, methane feed gas, pass through four tower Flow obtains the rich H of high-purity2While with CO products, high-purity liquid methane can be obtained, CO purity reaches volume fraction More than 99%, liquid methane purity volume content reaches more than 98%, and impurity removal is clean, and H2, CO and methane the rate of recovery it is high, H2Device pair is reduced to the adaptable of unstripped gas with the rate of recovery more than 99% of methane, the CO rate of recovery more than 88%, device The requirement of unstripped gas impurity.

The system that the present invention produces hydrogen rich gas and carbon monoxide from unstripped gas is produced on the premise of equipment is not increased according to CO The pressure of product gas, extracts low-temperature receiver and heat source of a part of CO circulations as rectifying column out from the final stage or intergrade of CO compressors, takes Disappeared nitrogen compressor and expanding machine, and equipment is less, and investment is small.

The present invention high liquid methane of production economy added value while high purity carbon monoxide and hydrogen rich gas, is set Single azeotrope refrigeration system, increases equipment azeotrope compressor, but mix refrigerant is mainly by nitrogen, first The materials such as alkane, ethene, propane, isopentane configure a certain proportion of cryogen according to the different compositions of unstripped gas and mix, and freeze Energy consumption is low.

Brief description of the drawings

Fig. 1 is the structure diagram of the system of high purity carbon monoxide of the present invention and hydrogen rich gas coproduction liquid methane.

It is labeled as in figure:1st, azeotrope compressor;2nd, raw material gas purifying unit;3rd, CO products compressor;4th, Low Temperature Liquid Change separative element;5th, main heat exchanger;6th, methane tower is washed;7th, dehydrogenation tower;8th, domethanizing column;9th, denitrification column;10th, the first evaporator; 11st, the second evaporator;12nd, the 3rd evaporator;13rd, the first condenser;14th, the second condenser;15th, the 7th throttle valve;16th, the 6th Throttle valve, 17, first throttle valve;18th, second throttle;19th, the 3rd throttle valve;20th, the 5th throttle valve;21st, the 4th throttle valve; 100th, the first pipeline;101st, second pipe;102nd, the 3rd pipeline;103rd, the 4th pipeline;104th, the 5th pipeline;105th, the 6th pipe Road;106th, the 7th pipeline;107th, the 8th pipeline;108th, the 9th pipeline;109th, the tenth pipeline;110th, the 11st pipeline;111st, 12 pipelines;112nd, the 13rd pipeline;113rd, the 14th pipeline;114th, the 15th pipeline;115th, the 16th pipeline;116th, the tenth Seven pipelines;117th, the 18th pipeline;118th, the 19th pipeline;119th, the 20th pipeline;120th, the 21st pipeline;121st, second 12 pipelines;122nd, the 23rd pipeline;123rd, the 24th pipeline;124th, the 25th pipeline;125th, the 26th pipeline; 126th, the 27th pipeline;127th, the 28th pipeline;128th, the 29th pipeline;129th, the 30th pipeline;130th, the 30th One pipeline;131st, the 32nd pipeline;132nd, the 33rd pipeline;133rd, the 34th pipeline;134th, the 35th pipeline; 135th, the 36th pipeline;136th, the 37th pipeline;137th, the 38th pipeline;138th, the 39th pipeline;139th, the 4th Ten pipelines;140th, the 41st pipeline;141st, the 42nd pipeline;142nd, the 43rd pipeline;143rd, the 44th pipeline; 144th, the 45th pipeline.

Embodiment

With reference to specific embodiment, the present invention is further elaborated.

Embodiment one

As shown in Figure 1, the system of a kind of high purity carbon monoxide and hydrogen rich gas coproduction liquid methane, which mainly wraps Include raw material gas purifying unit 2, low-temperature liquefaction separative element 4, CO products compressor 3, azeotrope compressor 1;The low temperature Liquefaction separative element includes main heat exchanger 5, washes methane tower 6, dehydrogenation tower 7, domethanizing column 8, denitrification column 9, the dehydrogenation tower tower Bottom is equipped with the first evaporator 10, and the domethanizing column bottom of towe is equipped with the second evaporator 11, tower top is equipped with the first condenser 13, institute The denitrification column bottom of towe stated is equipped with the 3rd evaporator 12, tower top is equipped with the second condenser 14;Described 2 entrance of clean unit connection the One pipeline 100, the clean unit outlet are connected by second pipe 101 with main heat exchanger 5;It is described to wash under methane tower 6 Portion's entrance is connected by the 3rd pipeline 102 with the main heat exchanger 5, is washed methane top of tower gaseous phase outlet and is passed through the 4th pipeline 103 are connected with main heat exchanger 5, and main heat exchanger 5 is connected with the 5th pipeline 104, wash methane tower bottom liquid-phase outlet by the 6th Pipeline 105 is connected with first throttle valve 17;First throttle valve 17 is connected by the 7th pipeline 106 with main heat exchanger 5, and master changes Hot device 5 is connected by the 8th pipeline 107 with 7 centre entrance of dehydrogenation tower, and first throttle valve 17 passes through the 9th pipeline 108 It is connected with 7 upper entrance of dehydrogenation tower;7 top gas phase of the dehydrogenation tower outlet passes through the tenth pipeline 109 and main heat exchanger 5 It is connected, main heat exchanger 5 is connected with the 11st pipeline 110, and dehydrogenation tower bottom liquid-phase outlet passes through the 12nd pipeline 111 and Two throttle valves 18 are connected;Second throttle 18 is connected by the 13rd pipeline 112 with main heat exchanger 5, and main heat exchanger 5 passes through 14th pipeline 113 is connected with 8 lower entrances of domethanizing column, and second throttle 18 passes through the 15th pipeline 114 and main heat exchange Device 5 is connected, and main heat exchanger 5 is connected by the 16th pipeline 115 with 8 centre entrance of domethanizing column;8 bottom of domethanizing column Portion's liquid-phase outlet is connected by the 17th pipeline 116 with main heat exchanger 5, and main heat exchanger 5 is connected with the 18th pipeline 117, The outlet of 8 top gas phase of domethanizing column is connected by the 19th pipeline 118 with the 26th pipeline 125,8 top gas of domethanizing column Mutually outlet is connected by the 20th pipeline 119 with 9 centre entrance of denitrification column, and first condenser 13 of the top of domethanizing column 8 exports It is connected by the 21st pipeline 120 by the 3rd throttle valve 19 with the top of denitrification column 9 second condenser, 14 entrance;It is described de- The outlet of 9 bottom liquid phases of nitrogen tower is connected by the 22nd pipeline 121 with the 4th throttle valve 21, and the 4th throttle valve 21 passes through second 13 pipelines 122 are connected with the top of denitrification column 9 second condenser, 14 entrance, and the outlet of denitrification column upper gaseous phase passes through the 24th pipe Road 123 is connected with main heat exchanger 5, and main heat exchanger 5 is connected with the 25th pipeline 124, and the outlet of denitrification column top gas phase passes through the 26 pipelines 125 are connected with main heat exchanger 5, and main heat exchanger 5 produces mouth compressor by the 27th pipeline 126 with the CO 3 entrances are connected.

The CO products compressor 3 is connected by the 28th pipeline 127 with main heat exchanger 5, and main heat exchanger 5 passes through 29 pipelines 128 are connected with 7 the first evaporator of bottom of towe of dehydrogenation tower, 10 entrance, and the 29th pipeline 128 passes through the 3rd Ten pipelines 129 are connected with 11 entrance of the second evaporator of domethanizing column bottom of towe, and the outlet of the second evaporator 11 passes through the 31st pipe Road 130 is connected with the 32nd pipeline 131, and the outlet of the first evaporator 10 passes through the 32nd pipeline 132 and 5 phase of main heat exchanger Connection, main heat exchanger 5 are connected by the 33rd pipeline 132 with washing 6 upper entrance of methane tower, and 13 entrance of the first condenser leads to Cross the 34th pipeline 133 with the 33rd pipeline 132 to be connected, main heat exchanger passes through the 35th pipeline 134 and the 30th Four pipelines 133 are connected, and main heat exchanger 5 is connected by the 36th pipeline 135 with 3 centre entrance of CO products compressor, CO 3 centre exit of product compressor is connected by the 37th pipeline 136 with main heat exchanger 5, and main heat exchanger 5 passes through the 38th Pipeline 137 is connected with 9 the 3rd evaporator of bottom of denitrification column, 12 entrance, and the outlet of the 3rd evaporator 12 passes through the 39th pipeline 138 are connected by the 5th throttle valve 20 with the 23rd pipeline 122, the outlet of CO products compressor 3 and the 45th pipe Road 144 is connected.

1 gaseous phase outlet of azeotrope compressor is connected by the 40th pipeline 139 with main heat exchanger 5, and master changes Hot device 5 is connected by the 41st pipeline 140 through the 6th throttle valve 16 with main heat exchanger 5, and main heat exchanger 5 passes through the 42nd Pipeline 141 is connected with 1 entrance of azeotrope compressor, completes circulation, and 1 liquid-phase outlet of azeotrope compressor passes through the 40th Three pipelines 142 are connected with main heat exchanger 5, and main heat exchanger 5 is by the 44th pipeline 143 through the 7th throttle valve 15 and main heat exchange Device 5 is connected.

It is the main heat exchanger 5, first evaporator 10, second evaporator 11, the 3rd evaporator 12, described First condenser 13 and second condenser 14 be for vacuum brazing plate-fin heat exchanger, it is described to wash methane tower 6, dehydrogenation tower 7th, domethanizing column 8, denitrification column 9 are regular packed tower or filler and float valve combined type rectifying column.

Embodiment two

A kind of method of high purity carbon monoxide and hydrogen rich gas coproduction liquid methane, methane volumetric content for 0.5% ~ 10%, the raw gas pressure that nitrogen volume content is 4% ~ 8% is that 3.0MPa ~ 6.0MPa enters clean unit by the first pipeline, is led to Cross the trace amounts of CO in unstripped gas after the adsorbent in clean unit adsorbs2Removed with water, the unstripped gas after imurity-removal passes through Second pipe is cooled to ~ 100K into main heat exchanger, and methane tower is washed by raw material into described by the 3rd pipeline after cooling Methane wash come out, wash methane top of tower gaseous phase outlet obtain hydrogen volume content be more than 77% hydrogen rich gas, hydrogen rich gas Main heat exchanger is entered by the 4th pipeline and recycles cold and re-heat, sends out to obtain hydrogen rich gas by the 5th pipeline after hydrogen rich gas re-heat Product, is washed down washing methane in methane tower, and the hydrogen rich gas methane losses of tower top are few, is washing methane tower bottom liquid-phase outlet Obtain methane and be concentrated into raw material that volume content is 16% or so by the 6th pipeline through first throttle valve throttling refrigeration, throttling Pressure is 0.9MPa ~ 2.5MPa afterwards, is divided into two parts after throttling, a part by the 7th pipeline enter main heat exchanger re-heat to ~ 118K, enters in the middle part of dehydrogenation tower after re-heat through the 8th pipeline, and another part is directly accessed dehydrogenation tower top by the 9th pipeline and enters Mouthful, rectifying separation is carried out in dehydrogenation tower, the flash distillation that hydrogen volume content is more than 63% is obtained in dehydrogenation top of tower gaseous phase outlet Vapour, flashed vapour enter main heat exchanger by the tenth pipeline and recycle cold and re-heat, made after flashed vapour re-heat by the 11st pipeline Sent out for flashed vapour product, raw material after dehydrogenation tower bottom liquid-phase outlet is further concentrated is by the 12nd pipeline through the Two throttle valves throttle to 0.2MPa ~ 0.6MPa, and two parts are divided into after throttling, and a part enters main heat exchange by the 13rd pipeline Device re-heat enters domethanizing column lower entrances to ~ 132K after re-heat through the 14th pipeline, another part by the 15th pipeline into Enter main heat exchanger and be cooled to ~ 99K, domethanizing column centre entrance is entered by the 16th pipeline after cooling, in domethanizing column into Methane in row rectifying separation removal raw material, methane volumetric content is obtained more than 98% in demethanizer bottom liquid-phase outlet High-purity liquid methane, liquid methane enter main heat exchanger by the 17th pipeline and 2 K ~ 3K are subcooled, and pass through the 18th after supercooling Pipeline is sent out as liquid methane product, exports to obtain the raw material that CO volume contents are more than 92% in domethanizing column upper gaseous phase Denitrification column centre entrance is entered by the 20th pipeline, Nitrogen gas impurity is further removed in denitrification column, in denitrification column bottom liquid Mutually outlet obtain CO volume contents be more than 99% high-purity CO by the 22nd pipeline through the 4th throttle valve throttle to 0.15MPa ~ ~ 0.19MPa, enters the second condenser inlet at the top of denitrification column by the 23rd pipeline after throttling and is used as low-temperature receiver quilt Re-heat is gasified, and exports to obtain the rich nitrogen exhaust gas that nitrogen volume content is more than 82% in denitrification column upper gaseous phase, exhaust gas passes through second 14 pipelines enter main heat exchanger re-heat and recycle cold, after re-heat, are sent out by the 25th pipeline.

The cold of device is provided mainly by CO circulations throttling and refrigerant circulation throttling refrigeration, is gone out from CO product compressors A part of CO pressure of mouth is cooled to 145K ~ 160K by the 28th pipeline for 0.5MPa ~ 3.5MPa into main heat exchanger, cold But the first evaporator of dehydrogenation tower bottom, domethanizing column bottom of towe second are entered by the 29th pipeline and the 30th pipeline respectively afterwards Evaporator, is cooled in evaporator as heat source, and mixing is cold into main heat exchanger continuation by the 32nd pipeline after cooling But to ~ 100K, three parts are divided into after cooling, a part is entered by the 33rd pipeline washes methane tower, as cleaning solution by original Methane wash in material comes out, and another part is used as low-temperature receiver by the 34th pipeline into the first condenser of demethanizer overhead By re-heat partial gasification, obtain gas phase CO in the first condenser overhead and mixed by the 19th pipeline with the 26th pipeline gas phase Close, the first condenser lower curtate obtain liquid phase CO by the 21st pipeline through the 3rd throttle valve throttling after enter denitrification column second Condenser is as low-temperature receiver, and last part returns to main heat exchanger re-heat by the 35th pipeline and recycles cold, after recycling cold CO product compressor centre entrances are entered by the 36th pipeline, extracting a part of CO pressure out in the middle part of CO products compressor is 0.5MPa ~ 3.5MPa is cooled to 118K ~ 125K by the 37th pipeline into main heat exchanger, passes through the 38th pipe after cooling Road is cooled into the 3rd evaporator of denitrification column as heat source, after cooling by the 39th pipeline through the 5th throttle valve throttle to 0.15MPa ~ ~ 0.19MPa is mixed with the 23rd pipeline material, and the second condenser of denitrification column is entered after mixing, cold second Gasify to obtain CO volume contents by re-heat as more than 99% CO products as low-temperature receiver in condenser, CO products pass through the 26th pipe Road enter main heat exchanger re-heat recycling cold, recycle cold after into CO products suction port of compressor be compressed to 0.5MPa ~ ~ 3.5MPa is used as product by the 45th pipeline and is sent out;Mixed by methane, ethene, propane, isopentane and nitrogen in a ratio Into the azeotrope that pressure is 0.25MPa ~ 0.35MPa by being cooled after azeotrope compressor compresses to 3.0 ~ 4.0Mpa Separation, the gas phase cryogen from azeotrope compressor by the 40th pipeline into main heat exchanger be cooled to 118K ~ 125K, is throttled to 0.3 ~ 0.4MPa through the 6th throttle valve by the 41st pipeline after cooled and freezed, backflowed into main heat exchange Device re-heat, the liquid phase cryogen from azeotrope compressor are cooled to ~ 150K by the 43rd pipeline into main heat exchanger, lead to Cross the 44th pipeline and throttle through the 7th throttle valve to 0.3 ~ 0.4MPa and freeze, backflow after throttling refrigeration and answered into main heat exchanger Heat, main heat exchanger is sent out with another burst of cryogen mixing re-heat, is entered azeotrope compressor by the 42nd pipeline, is completed system SAPMAC method.

The system of high purity carbon monoxide and hydrogen rich gas coproduction liquid methane described in the present embodiment is embodiment one Described in, this is no longer going to repeat them.

Claims (8)

  1. A kind of 1. system of high purity carbon monoxide and hydrogen rich gas coproduction liquid methane, it is characterised in that:The system is mainly wrapped Include raw material gas purifying unit, low-temperature liquefaction separative element, CO products compressor and azeotrope compressor;The low-temperature liquefaction Separative element includes main heat exchanger, washes methane tower, dehydrogenation tower, domethanizing column and denitrification column, and the dehydrogenation tower bottom of towe is equipped with the One evaporator, the bottom of towe of the domethanizing column are equipped with the first condenser, the denitrification column bottom of towe equipped with the second evaporator, tower top The second condenser is equipped with equipped with the 3rd evaporator, tower top;The first pipeline that the entrance connection of the clean unit is supplied gas, it is described net Change unit outlet by second pipe with main heat exchanger to be connected;The lower entrances for washing methane tower pass through the 3rd pipeline and institute State main heat exchanger to be connected, the top gas phase outlet for washing methane tower is connected by the 4th pipeline with main heat exchanger, described The 5th pipeline of hydrogen rich gas is sent out in primary heat exchanger warm end connection, and the bottom liquid phases outlet for washing methane tower is connected by the 6th pipeline Logical first throttle valve;The first throttle valve connects main heat exchanger by the 7th pipeline, and the main heat exchanger passes through the 8th pipeline It is connected with the centre entrance of the dehydrogenation tower, the first throttle valve passes through the 9th pipeline and the upper entrance of the dehydrogenation tower It is connected;The dehydrogenation top of tower gaseous phase outlet is connected by the tenth pipeline with the main heat exchanger, the primary heat exchanger warm end The 11st pipeline of flash steam is sent out in connection;The bottom liquid phases outlet of the dehydrogenation tower passes through the 12nd pipeline and second throttle It is connected, the second throttle is connected by the 13rd pipeline with the main heat exchanger, and the main heat exchanger passes through the tenth Four pipelines are connected with the domethanizing column lower entrances, and the second throttle passes through the 15th pipeline and the main heat exchanger It is connected, the main heat exchanger is connected by the 16th pipeline with the domethanizing column centre entrance;The demethanizer bottoms Portion's liquid-phase outlet is connected by the 17th pipeline with the main heat exchanger, and liquid methane is sent out in the primary heat exchanger warm end connection The 18th pipeline;The top gas phase outlet of the domethanizing column is connected by the 19th pipeline with the 26th pipeline, institute The upper gaseous phase outlet for stating domethanizing column is connected by the 20th pipeline with denitrification column centre entrance, the top of the domethanizing column The first condensator outlet of portion entering by the 3rd throttle valve and the denitrification column the second condenser of top by the 21st pipeline Mouth is connected;The 22nd pipeline of bottom liquid phases outlet of the denitrification column, the 4th throttling is set on the 22nd pipeline Valve, the 4th throttle valve are connected by the 23rd pipeline with the second condenser inlet of top of the denitrification column, described de- The upper gaseous phase outlet of nitrogen tower is connected by the 24th pipeline with the main heat exchanger, and the primary heat exchanger warm end connection is sent out 25th pipeline of exhaust gas;The top gas phase outlet of the denitrification column is connected by the 26th pipeline and the main heat exchanger Logical, the main heat exchanger is connected by the 27th pipeline with the CO products suction port of compressor.
  2. 2. the system of a kind of high purity carbon monoxide according to claim 1 and hydrogen rich gas coproduction liquid methane, it is special Sign is:The CO products compressor is connected by the 28th pipeline with the main heat exchanger, and the main heat exchanger passes through 29th pipeline is connected with the first evaporator inlet of the dehydrogenation tower bottom of towe, the 29th pipeline and the 30th pipeline phase It is logical, entrance the 30th pipeline of connection of second evaporator of domethanizing column bottom of towe, the 31st pipeline of outlet, the 30th One pipeline is connected with the 32nd pipeline, and first evaporator outlet passes through the 32nd pipeline and the main heat exchanger phase Connection, the main heat exchanger are connected by the 33rd pipeline with the methane tower upper entrance of washing;First condenser Entrance connects the 34th pipeline, and the 34th pipeline is respectively communicated with the 33rd pipeline and the 35th pipeline, and the 35th Pipeline is connected with the main heat exchanger, and the main heat exchanger passes through the 36th pipeline and the CO products compressor centre entrance It is connected, the CO products compressor centre exit is connected by the 37th pipeline with the main heat exchanger, and the master changes Hot device is connected by the 38th pipeline with the 3rd evaporator inlet of denitrogenation tower bottom, and the 3rd evaporator outlet leads to Cross the 39th pipeline with the 5th throttle valve to be connected, the 5th throttle valve is connected with the 23rd pipeline, the CO productions Product compressor outlet connects the 45th pipeline.
  3. 3. the system of a kind of high purity carbon monoxide according to claim 1 and hydrogen rich gas coproduction liquid methane, it is special Sign is:The gaseous phase outlet of the azeotrope compressor is connected by the 40th pipeline with the main heat exchanger, described Main heat exchanger is connected by the 41st pipeline through the 6th throttle valve with the main heat exchanger, and the main heat exchanger passes through the 4th 12 pipelines are connected with azeotrope suction port of compressor;The azeotrope compressor liquid-phase outlet passes through the 43rd pipeline It is connected with the main heat exchanger, the main heat exchanger is by the 44th pipeline through the 7th throttle valve and the main heat exchanger phase Connection.
  4. 4. the system of a kind of high purity carbon monoxide according to claim 1 and hydrogen rich gas coproduction liquid methane, it is special Sign is:The main heat exchanger, first evaporator, second evaporator, the 3rd evaporator, first condensation Device and second condenser are the methane tower, dehydrogenation tower, domethanizing column, de- washed for vacuum brazing plate-fin heat exchanger Nitrogen tower is regular packed tower or filler and float valve combined type rectifying column.
  5. 5. the system of a kind of high purity carbon monoxide according to claim 1 and hydrogen rich gas coproduction liquid methane, it is special Sign is:The CO products compressor delivery pressure is:0.5 MPa ~3.5MPa;The CO products compressor is used for circulation portions Point extraction pressure be:0.5MPa~3.5MPa.
  6. 6. the system of a kind of high purity carbon monoxide according to claim 1 and hydrogen rich gas coproduction liquid methane, it is special Sign is:The clean unit inlet pressure is:3.0MPa ~ 6.0MPa, methane content volume fraction are 0.5% ~ 10%, and nitrogen contains It is 4% ~ 8% to measure volume fraction;The dehydrogenation pressure tower is 0.9MPa ~ 2.5MPa;The domethanizing column and denitrogenation pressure tower For 0.2MPa ~ 0.6MPa.
  7. 7. the system of a kind of high purity carbon monoxide according to claim 1 and hydrogen rich gas coproduction liquid methane, it is special Sign is:Azeotrope is mixed according to a certain percentage using nitrogen, methane, ethene, propane and isopentane.
  8. It is 8. a kind of using the system of high purity carbon monoxide as described in claim 1 and hydrogen rich gas coproduction liquid methane Method, it is characterised in that:This method is as follows:
    High nitrogen, the raw material of methane content enter clean unit by the first pipeline, are adsorbed by the adsorbent in clean unit Afterwards by the trace amounts of CO in unstripped gas2Removed with water, the unstripped gas after imurity-removal is cooled down by second pipe into main heat exchanger To certain temperature, the methane wash in raw material is come out into the methane tower of washing by the 3rd pipeline after cooling, in Xi Jia Alkane top of tower gaseous phase outlet obtains hydrogen rich gas, and hydrogen rich gas enters main heat exchanger by the 4th pipeline and recycles cold and re-heat, hydrogen-rich Sent out after gas re-heat by the 5th pipeline, the raw material after washing methane tower bottom liquid-phase outlet and obtaining methane concentration passes through the 6th pipe Road throttles through first throttle valve, two parts is divided into after throttling, a part enters main heat exchanger re-heat by the 7th pipeline, after re-heat Enter through the 8th pipeline in the middle part of dehydrogenation tower, another part is directly accessed dehydrogenation tower upper entrance by the 9th pipeline, in dehydrogenation tower Interior progress rectifying separation, obtains flash steam, flashed vapour enters main heat exchanger by the tenth pipeline in dehydrogenation top of tower gaseous phase outlet Cold and re-heat are recycled, is sent out by the 11st pipeline after flashed vapour re-heat, is obtained further in dehydrogenation tower bottom liquid-phase outlet Raw material after concentration is throttled by the 12nd pipeline through second throttle, and two parts are divided into after throttling, and a part passes through the 13rd Pipeline enters main heat exchanger re-heat, enters domethanizing column lower entrances through the 14th pipeline after re-heat, and another part passes through the tenth Five pipelines are cooled to certain temperature into main heat exchanger, enter domethanizing column centre entrance by the 16th pipeline after cooling, Demethanizer bottom liquid-phase outlet obtains high-purity liquid methane, and liquid methane enters main heat exchanger mistake by the 17th pipeline It is cold, sent out after supercooling by the 18th pipeline, export to obtain certain density CO by the 20th in domethanizing column upper gaseous phase Pipeline enters denitrification column centre entrance, and the further imurity-removal in denitrification column, exports to obtain high-purity in denitrification column bottom liquid phases Degree CO is throttled by the 22nd pipeline through the 4th throttle valve, is entered after throttling by the 23rd pipeline second at the top of denitrification column Condenser inlet exports to obtain rich nitrogen exhaust gas as low-temperature receiver, in denitrification column upper gaseous phase, exhaust gas by the 24th pipeline into Enter main heat exchanger re-heat and recycle cold, after re-heat, sent out by the 25th pipeline;The cold of device is mainly by CO repetends Stream and refrigerant circulation throttling refrigeration provide, and a part of CO from CO product compressor outlets is entered by the 28th pipeline Main heat exchanger is cooled to certain temperature, enters dehydrogenation tower bottom the by the 29th pipeline and the 30th pipeline respectively after cooling One evaporator, the second evaporator of domethanizing column bottom of towe, are cooled in evaporator as heat source, are mixed after cooling and pass through the 30th Two pipelines continue to cool down into main heat exchanger, and three parts are divided into after cooling, and a part is entered by the 33rd pipeline washes methane Tower, comes out the methane wash in raw material as cleaning solution, another part enters demethanizer overhead by the 34th pipeline First condenser by re-heat partial gasification, obtains gas phase CO in the first condenser overhead and passes through the 19th pipeline and as low-temperature receiver 26 pipeline gas phases mix, and obtain liquid phase CO in the first condenser lower curtate and are throttled by the 21st pipeline through the 3rd throttle valve Enter the second condenser of denitrification column afterwards to return to main heat exchanger re-heat as low-temperature receiver, last part by the 35th pipeline and recycle Cold, recycles and enters CO product compressor centre entrances by the 36th pipeline after cold, extracted out in the middle part of CO products compressor A part is cooled down by the 37th pipeline into main heat exchanger, is steamed after cooling by the 38th pipeline into denitrification column the 3rd Hair device is cooled as heat source, is mutually mixed with the 23rd pipeline material through the 5th throttle valve by the 39th pipeline after cooling Close, the second condenser of denitrification column is entered after mixing, be used as low-temperature receiver to be gasified to obtain CO products, CO productions by re-heat in the second condenser Product enter main heat exchanger re-heat by the 26th pipeline and recycle cold, enter the progress of CO products suction port of compressor after recycling cold It is compressed to certain pressure and product submitting is used as by the 45th pipeline;Gas phase cryogen from azeotrope compressor passes through 40 pipelines are cooled down into main heat exchanger, are cooled to after certain temperature by the 41st pipeline through the 6th throttle valve section Stream refrigeration, backflows into main heat exchanger, and the liquid phase cryogen from azeotrope compressor is changed by the 43rd pipeline into master Hot device is cooled to certain temperature extraction, by the 44th pipeline through the 7th throttle valve throttling refrigeration, backflow after throttling refrigeration into Enter main heat exchanger, main heat exchanger is sent out with another burst of cryogen mixing re-heat, compressed by the 42nd pipeline into azeotrope Machine, completes kind of refrigeration cycle.
CN201610359591.0A 2016-05-27 2016-05-27 The system and method for high purity carbon monoxide and hydrogen rich gas coproduction liquid methane CN105865147B (en)

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CN104236253A (en) * 2014-07-01 2014-12-24 开封空分集团有限公司 Device and method for extracting pure carbon monoxide and oxygen-rich gas by aid of cryogenic technology
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US6295837B1 (en) * 1999-05-26 2001-10-02 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Apparatus for air separation
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CN103523751A (en) * 2013-09-29 2014-01-22 开封空分集团有限公司 Device and method for performing cryogenic separation and purification on carbon monoxide and hydrogen
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